{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:FJK5LDMJVPHXOPSCG4PAISMFOJ","short_pith_number":"pith:FJK5LDMJ","canonical_record":{"source":{"id":"1809.00389","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-09-02T20:48:43Z","cross_cats_sorted":["math.OC","quant-ph"],"title_canon_sha256":"568e8cfd037342a81e9c52040701f8e1782cd1151b7c2ad2dac8c498daa6290f","abstract_canon_sha256":"2aa2172147b73de9381912c3524053ccc5e76470d37b31c99359ddf19679945e"},"schema_version":"1.0"},"canonical_sha256":"2a55d58d89abcf773e42371e0449857268d81ea5ac883c3df9fa2a0fc4bfc15b","source":{"kind":"arxiv","id":"1809.00389","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.00389","created_at":"2026-05-18T00:06:35Z"},{"alias_kind":"arxiv_version","alias_value":"1809.00389v1","created_at":"2026-05-18T00:06:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.00389","created_at":"2026-05-18T00:06:35Z"},{"alias_kind":"pith_short_12","alias_value":"FJK5LDMJVPHX","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"FJK5LDMJVPHXOPSC","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"FJK5LDMJ","created_at":"2026-05-18T12:32:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:FJK5LDMJVPHXOPSCG4PAISMFOJ","target":"record","payload":{"canonical_record":{"source":{"id":"1809.00389","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-09-02T20:48:43Z","cross_cats_sorted":["math.OC","quant-ph"],"title_canon_sha256":"568e8cfd037342a81e9c52040701f8e1782cd1151b7c2ad2dac8c498daa6290f","abstract_canon_sha256":"2aa2172147b73de9381912c3524053ccc5e76470d37b31c99359ddf19679945e"},"schema_version":"1.0"},"canonical_sha256":"2a55d58d89abcf773e42371e0449857268d81ea5ac883c3df9fa2a0fc4bfc15b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:35.344967Z","signature_b64":"AQkFYHOa7kmP8zsoJMj/FfwaY1EnC17zBY3QO6Do4ypMECSpJDTBo3Z3XkL8+WMhg37lzisKMxa2/MS+zkmzCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2a55d58d89abcf773e42371e0449857268d81ea5ac883c3df9fa2a0fc4bfc15b","last_reissued_at":"2026-05-18T00:06:35.344409Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:35.344409Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.00389","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:06:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M72z9XWHl4d46SrZI1XQyVkyojrbucm6DrokyEcGbDxQsKg6JLymSA+tLO9rJJ3Kv7qOarpAXnqUnsiEbBkRBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T01:01:18.010539Z"},"content_sha256":"a52a0eb774b0e0111ba90a22167d59c9cb3a0e3c964447633f7dcdbba135441d","schema_version":"1.0","event_id":"sha256:a52a0eb774b0e0111ba90a22167d59c9cb3a0e3c964447633f7dcdbba135441d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:FJK5LDMJVPHXOPSCG4PAISMFOJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Direct coupling coherent quantum observers with discounted mean square performance criteria and penalized back-action","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.OC","quant-ph"],"primary_cat":"cs.SY","authors_text":"Ian R. Petersen, Igor G. Vladimirov","submitted_at":"2018-09-02T20:48:43Z","abstract_excerpt":"This paper is concerned with quantum harmonic oscillators consisting of a quantum plant and a directly coupled coherent quantum observer. We employ discounted quadratic performance criteria in the form of exponentially weighted time averages of second-order moments of the system variables. Small-gain-theorem bounds are obtained for the back-action of the observer on the covariance dynamics of the plant in terms of the plant-observer coupling. A coherent quantum filtering (CQF) problem is formulated as the minimization of the discounted mean square of an estimation error, with which the dynamic"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.00389","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:06:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rT5w7yQN9OEGlTJlH9pItsVZWaeC5D902+dCSAWjnJGlDB/RmTDey769rTLiLFT1w1iXDWC/TX2Q1+5o06FRCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T01:01:18.010879Z"},"content_sha256":"67e5c89a676aeb4f553503c10540702be8770d274bdf6cd64882d5634a98d7e0","schema_version":"1.0","event_id":"sha256:67e5c89a676aeb4f553503c10540702be8770d274bdf6cd64882d5634a98d7e0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FJK5LDMJVPHXOPSCG4PAISMFOJ/bundle.json","state_url":"https://pith.science/pith/FJK5LDMJVPHXOPSCG4PAISMFOJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FJK5LDMJVPHXOPSCG4PAISMFOJ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-09T01:01:18Z","links":{"resolver":"https://pith.science/pith/FJK5LDMJVPHXOPSCG4PAISMFOJ","bundle":"https://pith.science/pith/FJK5LDMJVPHXOPSCG4PAISMFOJ/bundle.json","state":"https://pith.science/pith/FJK5LDMJVPHXOPSCG4PAISMFOJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FJK5LDMJVPHXOPSCG4PAISMFOJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FJK5LDMJVPHXOPSCG4PAISMFOJ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"2aa2172147b73de9381912c3524053ccc5e76470d37b31c99359ddf19679945e","cross_cats_sorted":["math.OC","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-09-02T20:48:43Z","title_canon_sha256":"568e8cfd037342a81e9c52040701f8e1782cd1151b7c2ad2dac8c498daa6290f"},"schema_version":"1.0","source":{"id":"1809.00389","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.00389","created_at":"2026-05-18T00:06:35Z"},{"alias_kind":"arxiv_version","alias_value":"1809.00389v1","created_at":"2026-05-18T00:06:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.00389","created_at":"2026-05-18T00:06:35Z"},{"alias_kind":"pith_short_12","alias_value":"FJK5LDMJVPHX","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"FJK5LDMJVPHXOPSC","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"FJK5LDMJ","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:67e5c89a676aeb4f553503c10540702be8770d274bdf6cd64882d5634a98d7e0","target":"graph","created_at":"2026-05-18T00:06:35Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"This paper is concerned with quantum harmonic oscillators consisting of a quantum plant and a directly coupled coherent quantum observer. We employ discounted quadratic performance criteria in the form of exponentially weighted time averages of second-order moments of the system variables. Small-gain-theorem bounds are obtained for the back-action of the observer on the covariance dynamics of the plant in terms of the plant-observer coupling. A coherent quantum filtering (CQF) problem is formulated as the minimization of the discounted mean square of an estimation error, with which the dynamic","authors_text":"Ian R. Petersen, Igor G. Vladimirov","cross_cats":["math.OC","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-09-02T20:48:43Z","title":"Direct coupling coherent quantum observers with discounted mean square performance criteria and penalized back-action"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.00389","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:a52a0eb774b0e0111ba90a22167d59c9cb3a0e3c964447633f7dcdbba135441d","target":"record","created_at":"2026-05-18T00:06:35Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"2aa2172147b73de9381912c3524053ccc5e76470d37b31c99359ddf19679945e","cross_cats_sorted":["math.OC","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SY","submitted_at":"2018-09-02T20:48:43Z","title_canon_sha256":"568e8cfd037342a81e9c52040701f8e1782cd1151b7c2ad2dac8c498daa6290f"},"schema_version":"1.0","source":{"id":"1809.00389","kind":"arxiv","version":1}},"canonical_sha256":"2a55d58d89abcf773e42371e0449857268d81ea5ac883c3df9fa2a0fc4bfc15b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2a55d58d89abcf773e42371e0449857268d81ea5ac883c3df9fa2a0fc4bfc15b","first_computed_at":"2026-05-18T00:06:35.344409Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:35.344409Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AQkFYHOa7kmP8zsoJMj/FfwaY1EnC17zBY3QO6Do4ypMECSpJDTBo3Z3XkL8+WMhg37lzisKMxa2/MS+zkmzCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:35.344967Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.00389","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a52a0eb774b0e0111ba90a22167d59c9cb3a0e3c964447633f7dcdbba135441d","sha256:67e5c89a676aeb4f553503c10540702be8770d274bdf6cd64882d5634a98d7e0"],"state_sha256":"88d7bd377abd013aca8f92cc4dfc4132a80830ece3387d0787cb1a8fb8098533"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"byfh2f3IRZoOIX6ShDz7cljd7yGXeIiGHUvjzPslxvr4RlyTAQOUvceWacQovfE+LNwn3hMUkJJEsxdNy0GmBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T01:01:18.012680Z","bundle_sha256":"50ca89ef29b5c0ba986574ec1dbed21b1a2a73e393ed6312bcdb62f0ba9d4bf4"}}